1. Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, University of Toulouse 3 , Toulouse , France
2. Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania , Philadelphia, PA 19104 , USA
3. Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania , Philadelphia, PA 19104 , USA